-
. two trains of length 1/6 miles are moving towardeach other with a speed of 60 miles per hour.aproaching toward each other In how much timethey will cover each other.ans.10 secPLEASE TELL THE APPROACH FOR TIS
atreya
- Aug 28th, 2012
Total dist travelled=(1/6+1/6)=1/3miles
relative speed=(60+60)=120miles per hour
therefore,
time=dist/speed
=(1/3)/120=(1/360)hours=10secs(1hr=3600secs).tmhasan7
- Sep 25th, 2006
1. Its obvious that since the trains travel towards each other the speed is 60+60 miles/hr2. The two trains will take 2/6 miles to cross themselves, since the length of the train is 1/6 miles.3. If it...
-
There is A staircase having n steps (odd or even). A person standing at the base Can take one or two-steps at a time. My query is in how many ways can The stairs can be climbed?
sanjay_sharma
- Aug 23rd, 2012
Its not the n+1th fibonacci no., the ans is nth fibanacci no.
for eg:-
if no of steps is 3 then n=3
if no of steps is 4 then n=5
if no of steps is 5 then n=8
for 6 n=13
for 7 n=21
for 8 n=34 and so on...Aravindan
- Mar 27th, 2012
Ans is Fibonacci series.... if its n steps., then its n+1th fibo no.
-
-
I bought 2 nursery drapes for less than 10 $ . If i bought as many yards of each as there were pieces per yard in cents . I paid 215 cents more for one of them . Then how many yards of each did i buy ?
Mark Haynes
- Apr 23rd, 2012
1) "I bought 2 nursery drapes for less than $10." $10 = ?1000 ?999 < ?10002) "If i bought as many yards of each as there were pieces per yard in cents."1 yard = ?13) "I paid 215 cents more for one of...
-
Ramesh sit around a round table with some other men. He has one rupee more than his right person and this person in turn has 1 rupee more than the person to his right and so on, Ramesh decided to give 1 rupee to his right & he in turn 2 rupees to his right and 3 rupees to his right & so on. This process went on till a person has 'no money' to give to his right. At this time he has 4 times the money to his right person. How many men are there along with Ramesh and what is the money with poorest fellow.
Suraj Grewal
- Feb 11th, 2012
There are 3 persons sitting with the right hand of Ramesh
assume Ramesh=4
a=3
b=2
c=1
Ramesh gives 1 rs/- to a he has 3 left
now a has 4 and gives 2 to b remaining a has 2
now b has 4 and gives 3 to c remaining b has 1
now c has 4 and gives 4 to Ramesh and remaining c has 0.
gaurav4067
- Dec 7th, 2010
Here, consider there are n number of persons sitting on the table. Let Ramesh has Rs. x. Then the person to his right will have (x-1) then to his right will have (x-2) and so on till the person to...
-
-
Managing Director interview Puzzle
A managing director interviewed candidates for a Responsible position in his company, finally arriving at three whom he could Not separate. He called them together and said, "in my desk i have some Small sticky discs, some of which are black and some white. Close Your eyes and i will stick one on the forehead of each of you. You Must then go into the next room which has no furniture or mirrors. You...
-
Albert and Fernandes have two leg swimming race. Both start from opposite ends of the pool. On the first leg, the boys pass each other at 18 m from the deep end of the pool. During the second leg they pass at 10 m from the shallow end of the pool. Both go at constant speed but one of them is faster. Each boy rests for 4 seconds at the end of the first leg. What is the length of the pool?
shraisy
- Sep 29th, 2011
@gaurav4607
will we not consider the time they took for rest at each end . i.e 4 seconds ?gaurav4067
- Dec 8th, 2010
The solution is :Let the length of swimming pool be : Dlet their speed be x and y. So acc. to ques the fast swimmer (let x) would start from shallow end. Thuslet they first meet after time: t1x ....
-
Train Speed
A train ran at a certain speed for one hour and then due to a technical problem, it ran at 3/5th of its original speed and reached the destination 2 hrs late. The driver said, had the problem occurred 50 miles later, we would have gained 40 minutes. What is the distance between the two cities that the train
traveled?Abhash SInha
- Sep 4th, 2011
In this question, we have to solve for original time and original speed and then we will calculate the total distance. Let x & y be the speed & time respectively. Therefore, total distance=xy mile FI...
hsirah
- Oct 1st, 2010
Total distance is 200 km.Case 1: t1 + t2 = T +120Case 2: t1 + t2_ + t3_ = T+80t2 -(t2_+t3_) = 40(t2-t3_)-t2 = 40t2 = x2/(3/5*x1/60)t3_ = x3_/(3/5*x1/60)t2 = x2_/x1/60Also x2 - x3_=50you can solve for ...
-
In an Island the natives lie and visitors speak truth. A man wants to know whether a salesman beside him in a bar is a native or visitor. He asked him to ask a woman beside him whether she is a native or visitor. He replied "she says she is a visitor". Then he knew that the salesman is a native or visitor. salesman is in which category , native or visitor?
Read Best Answer
Editorial / Best Answer
Answered by: avinash shetty
- Jun 26th, 2007
The answer is he is a visitor i.e. he is telling the truth
Reason:
If he was a native i.e. a liar then his answer would would have been "she says she is a native" for both cases because
If she was visitor: she would have said she is a visitor and he would have lied that she is a native
If she was native: she would have lied and again say that she is a visitor and he would have lied that she is a native.
Best of luck byevinay
- Aug 23rd, 2011
The answer may be native, because without asking her the salesman said the answer, he says only in the condition when he is a liar, so liar means native
ganeshbhat
- Jan 14th, 2010
If the woman was a visitor then she would have accepted that she is a visitorIf the woman was a native then she would have lied that she is a visitorso in either case the woman says she is a visitorHe...
-
Pythagorean triplets with Consecutive natural numbers
For readers interested in Pythagorean triplets with Consecutive natural numbers, take any odd number -- say 11 -- and square It. 11 squared = 121 = 2(60)+ 1. Add 60 squared to both sides to get 11 squared + 60 squared = 60 squared + 2(60) + 1 = (60 + 1) squared = 61 squared. What do we get? (11, 60, 61). Works every time. Prove it For a general case.
stockball
- May 24th, 2011
This is an overly simple algebra question. The first form of the equation is x^2 = 2y + 1. The second form of the equation is x^2 + y^2 = (y+1) ^2, which is just y^2 + 2y + 1. Subtract the y^2 from both sides of the equation and you again have x^2 = 2y + 1.
C. Sivasankaran
- May 16th, 2006
There are some other ways also1. Multiples of the Odd number triplets, say for example 3, 4, 5 Its multiples also triplets i.e. 6,8,10 ; 9, 12, 15 ;&nbs...
-
There was a robbery happened at a bank and 3 suspects taken into custody. Their statementsA: I am innocentB: I am innocentC: B did it.I didn\'t remember names, In these three one is lying and we have to find the culprit
stockball
- May 24th, 2011
The question is invalid. If only one is lying, then if A & B told the truth and C lied, C is the culprit. But if C told the truth, then A also told the truth and B is the one lying, so B would be the culprit. Bad question.
arun4p
- Sep 2nd, 2006
Suppose c is the culprit and liar.then both a and b are talking the truth,and c who is the culprit is telling the lie.
-
Can u find the numbers such that sum of every 2 and sum of all 4 may be perfect squares.
praveenscience
- Mar 12th, 2011
The four numbers are:
A. 10430
B. 3970
C. 2114
D. 386
Explanation:
A+B = 14400 = 1202
A+C = 12544 = 1122
A+D = 10816 = 1042
B+C = 6084 = 782
B+D = 4356 = 662
C+D = 2500 = 502
A+B+C+D = 16900 = 1302
Hope this is correct! :)
Bharath Shetty
- Sep 25th, 2006
Hi SoorajCould you please share the logic used for the same?i.e. sum of every 2 nos and sum of eevery 4 nos is a squareAppreciate ur helpregardsBharath
-
A jail has 100 cells, numbered 1 to 100. The king Declares some sort of amnesty and orders the following. step 1: make sure all Cells are closed step2: reverse (if open, close; if close, open) those Cells whose numbers are divisible by 1 (in this step, all cells will be Opened); step 3: reverse those that are divisible by 2 (in this step, All even numbered cells will be closed); step 4: reverse those that are Divisible by 3; step 5: reverse those divisible by 4; step 6 to step 101: and so on . . . step 102: release the prisoners in those cells which are finally Open. How many prisoners will be released, and from which cells?
vamsi_krishna475
- Dec 26th, 2010
A small modification for the first ans is that, 1 is also opened along with all those perfect squares.
-
Quadrants
Can there be a line passing through all the four quadrants? If so, how?
bsrikanthreddy007
- Sep 7th, 2010
Yes,A thick straight (say a pipe) line inserted into the axis perpendicularly from the top view.
-
A says if 75 chickens are sold from what we have now the feed will last for extra 20 days. But B says if we buy additional 100 chickens then feed will get over 15 days earlier. Find the No. of chickens both are having now?
gaurav4067
- Dec 7th, 2010
The answer for this question is, there are 300 chickens and 60 days. by
solving the eqs
xy = (x-75)*(y+20).....................(1)
xy = (x+!00)*(y-15).....................(2)
Let x be the no. of chickens and the days be y
gaurav4067
- Dec 7th, 2010
he ans for this q is there are 300 chickens and 60 days. by solving the eqs xy (x-75)*(y+20)xy (x+!00)*(y-15)let x be the no of chickens and the days be y
-
The combined ages of reena ,seena are 44 yrs and reena is twic as old as seena was when reena was half the as old seena will be when seena is three times as old as reena was when reena was 3 times as old as seena. How old is reena??? (SakDev – 127)
gaurav4067
- Dec 5th, 2010
Reena and Seena's age ratio will be 5:3Because sum of their ages equals 44 so their ages will be 27.5 & 16.5
dichu
- Jun 3rd, 2006
i personally feel the quetion is ambiguous , slightly the language is incorrect
-
Hawkeye Foodlemyer is firing a rifle at a paper target 500m away. The target is 10cm square, and each bullet hole is circular, 1cm in diameter. The bullet holes are uniformly distributed in the target area, and none extend beyond the boundary. (A) How many bullets must be fired before there is a 50% chance that 2 bullet holes overlap? (B) How many bullets must be fired before there is a 50% chance that the next bullet hole will overlap an existing hole?
gaurav4067
- Dec 5th, 2010
Target 500m away not used in soln. (I guess given unnecessarily) we make holes on the target area , we get 10*10 = 100 holes on the sheet now we take one shot, and let say it hits any one hole. No...
-
Grass in lawn grows equally thickand in auniform rate. It takes 24 days for 70 cows and 60 for30 cows . How many cows can eat away the same in 96days.?
gaurav4067
- Dec 5th, 2010
g - grass at the beginning r - rate at which grass grows, per day y - rate at which one cow eats grass, per day n - no of cows to eat the grass in 96 days From given data, g + 24*r = 70 * 24...
Jaichandran.R
- Feb 13th, 2007
Answer is 10.When the days increases from 24 to 60, no. of cows decreases from 70 to 30,hence the reduction in cows for 36 days increment is obtained by half of the previous days cows ,that is 70/2= 3...
-
A girl visits to her cousin's house for a vacation. They both played a game for all the days she stayed there for every win they need to give a chocolate to the other. At the day when she left she had given 12 chocolates but had won 8 games. Find how many days she stayed there ?Ans:32please tell the approach
Venugopal668
- Nov 27th, 2010
8+8+12= 28 days she stayedfirstly she won 8 games she must loose all 8 so it will take 16 days then she lost 12 games to loose 12 chocolates
Debarghya
- Sep 19th, 2006
First of all the right question is:Last Year my cousin came to my place and we played a game where the loosing one has to give one chocolate to the person who won the game .At the end of the vacation,...
Challenging Puzzles
Read Best Answer
Ans